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Flexible and inflexible pipes and tubes made of metal, all for the transport of air and parts and fittings thereof; ducts of metal for ventilating and air-conditioning installations; air grilles of metal; fasteners of common metal; connectors of metal for pipes; connectors of metal for tubes; regulators [valves] of metal other than parts of machines; couplings of metal for tubing; metal vent covers for HVAC ducts; air ducts of metal for buildings; threaded bars of metal; pipe muffs of metal; collars of metal for fastening pipes.Heating, ventilating, and air-conditioning apparatus and purification equipment (ambient) and parts and fittings thereof, in particular air ducts for heating, cooling, ventilating and air-conditioning and purification purposes and parts and fittings thereof; valves for air conditioners; air filters; flues for ventilating apparatus; suction ventilators; dampers for ventilating installations; aeration apparatus; filters for exhaust extractors [parts of household or industrial installations]; filters for fume extractors; flues.Flexible pipes and tubes, not of metal, all for the transport of air and parts and fittings thereof; flexible pipes, tubes, hoses and fittings therefor (including valves), and fittings for rigid pipes, all non-metallic; non-metallic insulated pipes; hoses for air conditioners; non-metal pipe couplings and joints; packing materials; seals, sealants and fillers; pipe joint sealant; stuffing rings (non- metallic -); glands for pipes; non-metallic fittings for pipes; pipe fittings [junctions] (non-metallic -); junctions, not of metal, for pipes; thermally insulated pipes made of plastic; insulating materials for air ducts; insulating tapes; pipe wrappings for insulation purposes; insulated pipe supports; flexible tubing for insulation purposes; pipe muffs, not of metal; elbow joints (non-metallic -) for flexible pipes; pipe insulation; seals (non-metallic -) for pipes; acoustic insulation articles and materials.Inflexible tubes, not of metal, for the transport of air and parts and fittings thereof; ducts, not of metal, for ventilating and air-conditioning installations; non-metal vent covers; air ducts of non-metallic materials for buildings; non-metal vent covers for HVAC ducts.